The world's first curved auto darkening filter - especially for TIG welding! Until now, automatic blackout filters have always been flat. If you wanted a larger field of vision, you needed a larger helmet with plenty of room for it. Because the curved cassette is around the face, it is possible to fit a large field of view (150mm x 76mm) in a very slim mask. Light level 2.5, dark levels 8-12. Equipped with natural color technology for high-contrast vision.